some ZFS questions

[Warren Block]

On Sun, 24 Aug 2014, Michael Sierchio wrote:

> On Sun, Aug 24, 2014 at 8:00 PM, Warren Block <wblock at wonkity.com> wrote:
>> On Sun, 24 Aug 2014, Michael Sierchio wrote:
>>
>>> On Sun, Aug 24, 2014 at 6:42 PM,  <kpneal at pobox.com> wrote:
>>>
>>>
>>>> If you can use GPT partitioning then you can have GPT labels on
>>>> partitions
>>>> spanning entire disks. Then you can rearrange physical disks to your
>>>> hearts
>>>> content.
>>>>
>>>> The bonus is that you can put identifying information in the label name
>>>> to be even more sure you are replacing the correct disk when the time
>>>> comes.
>>>
>>>
>>> You can do this - and it's the approach that FreeNAS takes, but you
>>> lose the benefits of presenting a whole disk to ZFS - the ability to
>>> fully use the disk cache when presented a raw device rather than a
>>> partition.
>>
>>
>> I thought that was a Solaris-only limitation.  In fact, I'm pretty sure it
>> is, and does not apply on FreeBSD.
>
> You mean Solaris-only benefit?

No, I mean that the disk cache problem was only on Solaris, and does not 
apply to FreeBSD.  On FreeBSD, there is no difference in performance 
between partitions versus the whole disk.